JPH037568Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an overflow device in a diaphragm vaporizer.

[Prior Art] Conventionally, a diaphragm chamber and a primer pump in the vicinity thereof are connected through a suction passage, and a discharge passage extending from the primer pump is connected to a vertical overflow pipe through a joint. In the diaphragm vaporizer, when the fuel pumped up by the operation of the primer pump fills the diaphragm chamber and the primer pump and then is discharged outward from the overflow pipe, the siphon phenomenon occurs from the inside of the discharge passage to the inside of the overflow pipe. Fuel will remain. When a work machine equipped with this carburetor, such as a brush cutter, is operated, the remaining fuel may scatter from the overflow pipe and adhere to the worker's clothes or the fuel tank, creating a dangerous situation. The point was hot.

[Problem to be solved by the invention] The invention solves this problem by completely discharging the fuel from the vicinity of the end of the discharge passage to the inside of the overflow pipe so that no fuel remains. The present invention provides a simple structure that can be easily implemented, and can be prevented from scattering from an overflow pipe during work.

[Means for Solving the Problems] Therefore, in the present invention, a vertical slit is formed on the outer periphery of the lower side of the joint, extending over the lower end, and the upper part of the overflow pipe is inserted into the lower part of the joint until the midway point in the longitudinal direction of the slit. It is constructed by fitting.

[Function] Therefore, when the fuel is discharged from the overflow pipe by operating the primer pump, the fuel is vented through the slit and the siphon phenomenon does not occur, and the fuel is completely discharged so that no fuel remains in the overflow pipe. It will be possible.

[Example] Next, the embodiment shown in the drawings will be described.

FIG. 1 shows a cross-sectional view of a part of the diaphragm carburetor. Inside the diaphragm chamber 1, a fuel chamber 1a partitioned by a diaphragm 9 is provided with a boss 10, a control lever 11, etc. 1
b communicates with the crank chamber via the lead hole 8. The primer pump 4 below the diaphragm chamber 1 and the diaphragm chamber 1 communicate with each other via a suction passage 2 in which a check valve 12 is interposed.
A pipe joint 6 is provided vertically from the terminal end of the discharge passage 3 extending from the primer pump 4 with a recess 1 disposed above the joint 6.
4 are formed in communication with each other, and a blind plug 15 is fitted into the recess 14.

A vertical slit 7 is formed on the outer periphery of the lower side of the joint 6 over the lower end, and the upper part of the overflow pipe 5, which has a length of about 20 cm as in the conventional type, is extended to the middle of the longitudinal direction of the slit 7 as shown in FIG. And, as shown in FIG. 2, it is fitted into the lower part of the joint 6.

Therefore, as in the conventional case, the fuel pumped up by operating the primer pump 4 fills the diaphragm chamber 1 and then flows into the primer pump 4 from the suction passage 2, and after filling this, flows into the discharge passage 3. It flows out from inside the joint 6 through the overflow pipe 5 to the outside (into the atmosphere). However, the fuel that tends to remain from inside the overflow pipe 5 to the joint 6 and the discharge path 3 side is removed from the slit 7.
Since atmospheric pressure is applied through the water, the water is discharged as is from the overflow pipe 5 without causing the siphon phenomenon as in the conventional case.

[Effects of the invention] As described above, the present invention makes it possible to ventilate through the slit 7 in the middle, thereby solving the conventional drawback in which fuel remains in the joint 6 and the overflow pipe 5 due to the siphon phenomenon. As a result, the fuel can be completely discharged, and it is possible to completely prevent fuel from scattering from the overflow pipe 5 and causing a dangerous situation while operating a working machine such as a brush cutter equipped with this carburetor. Also, when discharging fuel, slit 7
It is possible to prevent fuel from adhering to the outer periphery of the overflow pipe 5 without flowing out from the overflow pipe 5, and it has the advantage that it can be suitably implemented with a simple structure of just forming a slit 7 on the outer periphery of the joint 6.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a part of a diaphragm vaporizer according to an embodiment of the present invention, FIG. 2 is an enlarged view of the part, and FIG. 3 is a sectional view taken along the line - in FIG. 1...Diaphragm chamber, 2...Suction path, 3...
Discharge path, 4...Primer pump, 5...Overflow pipe, 6...Joint, 7...Slit.

Claims (1)

[Scope of utility model registration request] A diaphragm chamber 1 and a primer pump 4 in its vicinity are communicated through a suction passage 2, and a discharge passage 3 extending from the primer pump 4 is connected to a vertical overflow pipe 5 through a joint 6. In the diaphragm vaporizer, a vertical slit 7 is formed on the outer periphery of the lower side of the joint 6 over the lower end, and the upper part of the overflow pipe 5 is fitted into the lower part of the joint 6 up to a midway point in the longitudinal direction of the slit 7. An overflow device characterized by comprising: